A contract for future sale is an agreement between two people or businesses to buy or sell something at a later date. It's like making a promise: one person agrees to buy something from the other in the future, and the other person agrees to sell it. Both people must keep their word and follow through with the sale. Think of it like making a reservation for a restaurant or a hotel: you are promising to show up in the future, and the restaurant or hotel is promising to have something available for you.